Hepatic Sarcoidosis
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Review Article Hepatic Sarcoidosis Micheal Tadros1, Faripour Forouhar2 and George Y. Wu1 1Department of Medicine, Division of Gastroenterology-Hepatology, University of Connecticut Health Center, Farmington, CT, USA; 2Department of Anatomic Pathology, University of Connecticut Health Center, Farmington, CT, USA Abstract ethnicities,6 with an age peak of 20–40 years.6 A second age peak (.50 years) has also been described.6 Sarcoidosis is a multisystem disease characterized by the The hallmark of sarcoidosis is the formation of epithelioid presence of non-caseating granulomas in affected organs. granulomas that are typically non-caseating, in the absence Pulmonary involvement is the most common site of disease of tuberculosis, fungal infection, malignancy, or other causes activity. However, hepatic involvement is also common in of granulomatous reactions.7 The pulmonary system is the sarcoidosis, occurring in up to 70% of patients. Most patients most common site of involvement, and is affected in about with liver involvement are asymptomatic. Therefore, the 90% of cases.6 Extra-thoracic sarcoidosis occurs in 40–50% majority of cases are discovered incidentally, frequently by of patients.8 Sites affected include peripheral lymph nodes the finding of elevated liver enzymes. Pain in the right upper (30%), the hepatic system, the spleen, stomach, small quadrant of the abdomen, fatigue, pruritus, and jaundice may bowel, bone, and skin. Involvement of the solid organs can be associated with liver involvement. Portal hypertension and present as organ enlargement. Dermatological sarcoidosis cirrhosis are complications linked to long-standing hepatic may present as erythema nodosum or lupus pernio. sarcoidosis. Liver biopsy is usually required to confirm the Myopathy, uveitis, granulomatous meningitis, facial nerve diagnosis. It is important to differentiate hepatic sarcoidosis palsy, cardiomyopathy, and parotid enlargement have been from other autoimmune and granulomatous liver diseases. reported less commonly. Not all cases of hepatic sarcoidosis require treatment. For There are two classic syndromes described for sarcoidosis. symptomatic patients, the first line treatment includes The first is Lo¨fgren syndrome, which is characterized by hilar corticosteroids or ursodeoxycholic acid. Various immunosup- lymphadenopathy, erythema nodosum, arthritis and fever.6 pressant agents can be used as second line agents. Rarely, The second is Heerfordton syndrome, which is characterized severe cases require liver transplantation. by uveitis, swelling of the parotid gland, fever, and facial E 2013 The Second Affiliated Hospital of Chongqing Medical palsy.9 University. Published by XIA & HE Publishing Ltd. All rights The pathogenesis of sarcoidosis is still not completely reserved. understood, but it is thought to be multifactorial, involving the interplay of immunological, genetic, and environmental Introduction factors.1,6 It has been theorized that an environmental trigger initiates a specific immune reaction in a genetically Sarcoidosis is an inflammatory disorder of unknown etiology predisposed individual. The immunological response in sar- categorized by the presence of non-caseating granulomas, coidosis includes T helper 1 (Th1) cells triggered by an which can involve multiple organs of the body,1 in the antigen, leading to cytokine production, mainly tumor absence of infections, other autoimmune diseases, and necrosis factor alpha10 which in turn, leads to macrophage exposure to foreign agents. It has been estimated that the aggregation with subsequent granuloma formation.11 Certain worldwide prevalence of sarcoidosis is 2–60 per 100,000 histocompatibility antigens have been associated with sar- people.2 Sarcoidosis affects all ethnicities with higher pre- coidosis such as human leukocyte antigen-A1 (HLA-A1), B8, valence rates described in patients of Scandinavian descent.2 DRB1, DQB1, and DRB3.12 This suggests a genetic suscept- In contrast, sarcoidosis has been only rarely reported in ibility and familial clustering of the disease. Some of the patients of Chinese and Taiwanese origin.3,4 In the USA, possible postulated triggers of environmental antigens African Americans have been reported to have a three times include reactive oxygen species, and viruses (herpes simplex higher age-adjusted incidence of the disease.1,5 Sarcoidosis virus, cytomegalovirus, retroviruses) and bacteria (Borrelia affects females more often than males across all ages and burgdorferi, mycobacteria).2,6 Keywords: Sarcoid; Granuloma; Epitheloid. Epidemiology of hepatic sarcoidosis Abbreviations: ACE, serum angiotensin converting enzyme; AFB, acid-fast bacteria; AMA, anti-mitochondrial antibody; ERCP, endoscopic retrograde cho- In biopsy and autopsy studies of patients with systemic langiopancreatography; MRCP, magnetic resonance cholangiopancreatography; sarcoidosis, liver involvement was found in about 50–80%,17 MRI, magnetic resonance imaging; p-ANCA, peripheral anti-neutrophil cytoplas- mic antibody; PBC, primary biliary cirrhosis; PSC, primary sclerosing cholangitis. whereas only 10–30% of patients presented with abnormal 2,18 Received: 21 September 2013; Revised: 9 October 2013; Accepted: 9 October liver enzymes during laboratory testing. The majority of 2013 q patients with hepatic sarcoidosis are asymptomatic, despite DOI of original article: 10.14218/JCTH.2013.00016. the presence of granulomas on biopsy, abnormal liver Correspondence to: George Y. Wu, Department of Medicine, Division of 14 Gastroenterology-Hepatology, University of Connecticut Health Center, enzymes, or radiological evidence of disease. It has been Farmington, CT 06030, USA. E-mail: [email protected] reported that the percentage of patients with clinically Journal of Clinical and Translational Hepatology 2013 vol. 1 | 87–93 Tadros M. et al: Sarcoid of the liver significant disease is less than 20%.19 Risk factors associated transplantation cases in the USA. Unfortunately, they often with hepatic sarcoidosis include African American ethnicity, have a worse prognosis than patients with other cholestastic prior exposure to pegylated interferon, and the presence of liver diseases such as primary biliary cirrhosis and primary splenomegaly.13,14,20 Reports on the differences in preva- sclerosingcholangitis.29 Some case reports have linked sar- lence based on gender have been contradictory. In studies coidosis with an increased risk of developing Budd-Chiari30 containing hundreds of patients, one study reported liver syndrome, hepatopulmonary syndrome,28 hepatocellular disease to be more common in women,21 whereas the other carcinoma,31,32 and biliary sarcoid mimicking cholangiocarci- showed the opposite.22 noma. Table 1 lists postulated mechanisms of liver injury in hepatic sarcoidosis. Table 2 summarizes the clinical spectrum Spectrum of hepatic sarcoidosis of the disease. There is a spectrum of clinical presentations of liver involve- Investigations ment in sarcoidosis. Of the more than 50% of patients who have hepatic granulomas on liver biopsy, only 10–30% have Elevations of alkaline phosphatase and/or gamma glutamyl- elevated serum liver enzymes.2,18 About 20% of patients transpeptidase have been correlated with cholestasis and have palpable hepatomegaly or splenomegaly. Radiological liver involvement.25,34 Alkaline phosphatase of hepatobiliary examination (ultrasound or computed tomography) is accu- origin can be elevated 5–10 times the upper limit of normal. rate in the detection of organomegaly, demonstrating this Aminotransferase elevations are usually mild and less fre- feature in about 40% of cases.13,17 However, even in cases of quent compared with elevations in alkaline phosphatase.19 elevated serum liver enzymes or radiological abnormalities, The severity of liver test abnormalities was shown to be evidence of organ dysfunction is rare. associated with the extent of granulomatous inflammation.33 Some clinical symptoms and signs suggest liver involve- Hyperglobulinema may be seen. Measurement of the serum ment, and may warrant a liver biopsy. Systemic symptoms angiotensin converting enzyme (ACE) levels can be useful; such as fatigue, fever, and arthralgias are non-specific, but they have been reported to be elevated in about 60% of are present in the majority of patients with active liver patients with active sarcoidosis.35–37 However, the test lacks sarcoidosis.23,24 More specific symptoms include jaundice sensitivity and specificity, with low positive and negative and pruritus, mostly from chronic cholestasis.25,26 Right predictive values (84 and 74%, respectively).38 Normal levels upper quadrant abdominal pain, in theory, results from can be seen in chronic forms and in patients who have been stretching of the Glisson’s capsule by hepatomegaly as a on corticosteroids. Therefore, a normal ACE level does not consequence of the increasing intrahepatic volume occupied rule out sarcoidosis, but an elevated level may help distin- by the developing hepatic granulomas. Abdominal pain has guish sarcoidosis from other granulomatous disease. been reported to occur in 15% of patients with sarcoidosis, Elevated ACE levels can also be present in patients with and jaundice in less than 5%.19 inflammatory bowel disease.36 Long-standing disease has been reported to result in Radiological studies39 such as ultrasonography,40 com- portal hypertension in 3–18% of patients.16 This may be due puted tomography (CT)41 or magnetic resonance imaging initially to compression of portal venules by granulomas,